MCQ
Electric field lines of force:
- AExist everywhere.
- BExist only in the immediate vicinity of electric charges.
- CExist only when both positive and negative charges are near one another.
- DAre imaginary.
✓
Answer
- Are imaginary.
Explanation:
Electric lines of force are imaginary.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
If light travels a distance x in 
sec in air and 10 x distance in 
sec in a medium, the critical angle of the medium will be
|
(a) |
(b) |
(c) |
(d) |
50 Ω and 100 Ω resistors are connected in series. This connection is connected with a battery of 2.4 volts. When a voltmeter of 100 Ω resistance is connected across 100 Ω resistor, then the reading of the voltmeter will be
|
(a) 1.6 V |
(b) 1.0 V |
(c) 1.2 V |
(d) 2.0 V |
The phase difference $ \phi $ is related to path difference $ \Delta x $ by :
→Light is an electromagnetic wave. Its speed in vacuum is given by the expression
|
(a) |
(b) |
(c) |
(d) |
If a white light is used in Young’s double slit experiments then a very large number of coloured fringes can be seen
|
(a) With first order violet fringes being closer to the central white fringes |
|
(b) First order red fringes being closer to the central white fringes |
|
(c) With a central white fringe |
|
(d) With a central black fringe |
In hydrogen atom, if transition of electron from third orbit to second orbit, then wavelength of emitted radiation will be :
How did de – Broglie modify Bohr’s postulate?
A constant current i is maintained in a solenoid. Which of the following quantities will increase if an iron rod is inserted in the soleniod along axis?
- Magnetic field at the centre.
- Mangetic flux linked with the solenoid.
- Self-inductance of the solenoid.
- Rate of Joule heating.
Three capacitors of 2μF, 3μF and 6μF are joined in series and the combination is charged by means of a 24 volt battery. The potential difference between the plates of the 6 μF capacitor is
|
(a) 4 volt |
(b) 6 volt |
(c) 8 volt |
(d) 10 volt |
A potentiometer circuit shown in the figure is set up to measure e.m.f. of a cell E. As the point P moves from X to Y the galvanometer G shows deflection always in one direction, but the deflection decreases continuously until Y is reached. In order to obtain balance point between X and Y it is necessary to
|
(a) Decreases the resistance R |
(b) Increase the resistance R |
|
(c) Reverse the terminals of battery V |
(d) Reverse the terminals of cell E |